Low-frequency counter

A frequency counter is indispensable
in the design, repair and test of audio and
hi-fi equipment. The counter presented here
can either be built into a sine wave or function
generator or, by the addition of a preamplifier,
powersupply and a suitable enclosure,
be made into a stand-alone unit. Its display
has only four digits, since three or four of
the usual seven or eight display digits are
not used in audio work. Three switched measuring ranges are provided:
0-100 Hz; 0-10 kHz;
and 0-100 kHz.

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